New lubricating grease compositions

ABSTRACT

Subject disclosure relates to novel and improved high temperature lubricating grease compositions in which a single component ingredient provides the composition with outstanding rust inhibiting characteristics as well as grease thickening properties. The improved grease compositions of the invention consist of specified diester, hydrocarbon and silicone fluids thickened and rust inhibited by specific quantities of the additive lithium cis-9-10-epimino octadecanoate.

United States Patent Stallings et al. 1 June 20, 1972 [54] NEW LUBRICATING GREASE References Ci ed COMPOSITIONS UNITED STATES PATENTS [72] inventors: Leon Stallings, Sicklerville, N..l.; Martin J. 2,801,969 8/1957 Morway et al ..252/33.6

Devine, Havertown, Pa.; Gerhard Maerker, Oreland, Pa.; Abner Eisner, Primary ExaminerDaniel E. Wyman Glenside, Pa. Assistant Examiner-l. Vaughn An R. .S' dA.W. Ill [73] Assignee: The United States of America as omey S clasclaan Co represented by the Secretary of the Navy I 57] ABSTRACT [22] Filed: Sept 1970 Subject disclosure relates to novel and improved high tem- 2 App], 74,488 perature lubricating grease compositions in which a single component ingredient provides the composition with outstanding rust inhibiting characteristics as well as grease thickening properties. The improved grease compositions of [52] US. Cl ..252/33.6, 252/496, 252/389 the invention consist of specified diester, hydrocarbon and sil- 51 Int. Cl. ..Cl0m 5/20, ClOm 7/30 icone fluids thickened and rust inhibited by specific quantities 5 8] Field of Search ..252/33.6, 49.6, 389 of the additive lithium cis-9-l0-epimino octadecanoate.

5 Claims, No Drawings I rust inhibiting properties.

It is therefore a principal object of the present invention to provide a novel and improved lubricating grease composition which has a single additive that provides the composition with outstanding grease thickening and rust inhibiting properties.

it is a further object of the invention to provide a novel and improved lubricating grease composition having a grease formulating process, the cost and complexity of which are substantially reduced as the result of the use of a single grease thickening rust inhibiting ingredient.

it is a further object of the invention to provide a novel and improved lubricating grease composition having a reduced incompatibility factor due to the use of a single grease thickening rust inhibiting ingredient.

These and other objects of the invention will be described or become apparent as the description thereof proceeds.

In general, the invention consists of a lubricating grease composition for a diester, hydrocarbon or silicone fluid thickened and rust inhibited with a metallic soap of cis-9-l0- epimino -opimino octadecanoate acid. One preferred diester fluid which is used in the improved lubricating grease composition of the invention is di-Z-ethylhexyl sebacate which has the chemical structural formula:

where R is the (CH radical and R is the ethylhexyl radical having the formula:

A preferred hydrocarbon fluid which is used in the improved lubricating grease composition of the invention is described in detail in the U. S. Government Military Specification MlL-L-6082C dated Aug. 10, 1955 and specified as Grade ll00. This lubricating oil has a Saybolt universal viscosity at 210 F of 93-103, a minimum viscosity index of 95, a minimum flash point of 470 F, an undiluted maximum pour point of 10 F, a diluted maximum pour point of 65 F and a maximum Conradson carbon residue of 1.2.

A preferred silicone fluid which is used in the improved lubricating grease composition of the invention is a methyl phenyl silicone polymer which has the chemical structural formula:

where R is either a methyl radical or a phenyl radical and there are approximately 0.35 phenyl groups to methyl groups in the polymer and where the viscosity of the polymer is 95.4 centistokes at 100 F and 20.68 centistokes at 210 F.

The preferred metallic soap of cis-9-lO-epimino octadecanoate acid was lithium cis-9-l0-epimino octadecanoate which is the chemical structural formula:

The invention will be more fully understood by reference to the following specific examples illustrating various modifications of the invention.

EXAMPLE I A lubricating grease composition was prepared in accordance with the invention by preheating 75-grams of the above described di 2 ethylhexyl sebacate to 450 F and slowly adding 25 grams of the lithium cis-9-l0-epimino. octadecanoate with stirring. The mixture was then allowed to cool to room temperature and was subjected to the various tests hereinafter described.

EXAMPLE II A lubricating grease composition was prepared in accordance with the invention by preheating grams of the above described di-2-ethylhexyl sebacate to 450 F and slowly adding 10 grams of the lithium cis-9-l0-epimino octadecanoate with stirring. The mixture was allowed to cool to room temperature and was subjected'to the various tests hereinafter described.

EXAMPLE III A lubricating grease composition was prepared in accordance with the invention by preheating 75 grams of the above described hydrocarbon lubricating oil to 450 F and slowly adding 25 grams of the lithium cis -9-lO-epimino octadecanoate with stirring. The mixture was allowed to cool to room temperature and was subjected to the various tests hereinafter described.

EXAMPLE IV A lubricating grease composition was prepared in accordance with the invention by preheating 90 grams of the above described hydrocarbon lubricating oil to 450 F and slowly adding 10. grams of the lithium cis-9-lO-epimino octadecanoate with stirring. The mixture was allowed to cool to room temperature and was subjected to the various tests hereinafter described.

EXAMPLE V A lubricating grease composition was prepared in accordance with the invention by preheating 75 grams of the above described silicone polymer to 450 F and slowly adding 25 grams of the lithium cis-9-l0-epimino octadecanoate with stirring. The mixture was allowed to cool to room temperature and was subjected to the various tests hereinafter described.

EXAMPLE VI A lubricating grease composition was prepared in accordance with the invention by preheating 90 grams of the above described silicone polymer to 450 F and slowly adding 10 grams of the lithium cis-Q-lO-epimino octadecanoate with stirring. The mixture was allowed to cool to room temperature and was subjected to the various tests hereinafter described.

Each of the grease compositions prepared in examples l-Vl were subjected to the standard ASTM Method No. D1403 worked and unworked grease penetration tests in which the relative penetration of a perforated conical device into each grease composition was recorded with the following results:

Example No. Unworked Penetration Worked Penetration 1 97 200 2 354 369 3 250 280 4 358 358 5 366 358 6 373 373 The dropping point of each of the grease compositions of examples l-Vl was also determined in accordance with the standard ASTM Method No. D2265 with the following results:

Example No. Dropping Point Temperature 1 380 F 2 280 F 3 330 F 4 280 F 5 340 F 6 330 F Each of the grease compositions of examples I-VI were also subjected to the standard ASTM Rust Preventative Property Test Method No. D1743 and the High Temperature Bearing Performance Test of the Federal Test Method Standard No. 7918 (Method 331 No visible corrosion was noted in any of the samples tested. Bearings performed under the high temperature performance tests exceptionally well. Bearings lubricated with examples I and II grease compositions, for example, continued to operate without failure at 250 F at 10,000 RPM for over 1,200 hours.

Obviously, many modifications and variations of the present invention are possible in the light of the above teachings. It is therefore to be understood that within the scope of the appended claims, the invention may be practiced otherwise than as specifically described.

What is claimed is:

l. A lubricating grease composition comprising:

5 a. 75 to 90 percent by weight of a fluid selected from the group consisting of di-2-ethylhexyl sebacate, a hydrocarbon lubricating oil having a Saybolt universal viscosity of 93-103 at 210 F, and methyl phenyl silicone having a viscosity of 95.4 centistokes at 100 F wherein the ratio of phenyl to methyl groupings is approximately 0.35,

b. and -25 percent by weight of lithium cis-9-10-epimino octadecanoate.

2. The grease composition substantially as described in claim 1 having percent by weight of lithium cis-9- 10- 15 epimino octadecanoate and 85 percent by weight of the fluid.

3. The grease composition substantially as described in claim 1 wherein the fluid is di-Z-ethylhexyl sebacate.

4. The grease composition substantially as described in claim 1 wherein the fluid is the said hydrocarbon lubricating oil.

5. The grease composition substantially as described in claim I wherein the fluid is the said methyl phenyl silicone. 

2. The grease composition substantially as described in claim 1 having 15 percent by weight of lithium cis-9-10-epimino octadecanoate and 85 percent by weight of the fluid.
 3. The grease composition substantially as described in claim 1 wherein the fluid is di-2-ethylhexyl sebacate.
 4. The grease composition substantially as described in claim 1 wherein the fluid is the said hydrocarbon lubricating oil.
 5. The grease composition substantially as described in claim 1 wherein the fluid is the said methyl phenyl silicone. 